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https://issues.apache.org/jira/browse/BEAM-9006?focusedWorklogId=363164&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-363164
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ASF GitHub Bot logged work on BEAM-9006:
----------------------------------------
Author: ASF GitHub Bot
Created on: 25/Dec/19 04:18
Start Date: 25/Dec/19 04:18
Worklog Time Spent: 10m
Work Description: sunjincheng121 commented on pull request #10462:
[BEAM-9006] Improve ProcessManager for shutdown hook handling.
URL: https://github.com/apache/beam/pull/10462
In this PR will solve the garbage collection issue as currently the class
`ProcessManager` will add a shutdown hook to stop all the living processes
before JVM exits. The shutdown hook will never be removed. If this class is
loaded by the user class loader, it will cause the user class loader could not
be garbage collected which causes meta space memory leak eventually.
Post-Commit Tests Status (on master branch)
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Lang | SDK | Apex | Dataflow | Flink | Gearpump | Samza | Spark
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Go | [](https://builds.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/)
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Java | [](https://builds.apache.org/job/beam_PostCommit_Java/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Apex/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Java_PVR_Flink_Batch/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Java_PVR_Flink_Streaming/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Gearpump/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Samza/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Java_PVR_Spark_Batch/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_SparkStructuredStreaming/lastCompletedBuild/)
Python | [](https://builds.apache.org/job/beam_PostCommit_Python2/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Python35/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Python36/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Python37/lastCompletedBuild/)
| --- | [](https://builds.apache.org/job/beam_PostCommit_Py_VR_Dataflow/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Py_ValCont/lastCompletedBuild/)
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| --- | --- | [](https://builds.apache.org/job/beam_PostCommit_Python_VR_Spark/lastCompletedBuild/)
XLang | --- | --- | --- | [](https://builds.apache.org/job/beam_PostCommit_XVR_Flink/lastCompletedBuild/)
| --- | --- | ---
Pre-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
--- |Java | Python | Go | Website
--- | --- | --- | --- | ---
Non-portable | [](https://builds.apache.org/job/beam_PreCommit_Java_Cron/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PreCommit_Python_Cron/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PreCommit_PythonLint_Cron/lastCompletedBuild/)
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| --- | ---
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Issue Time Tracking
-------------------
Worklog Id: (was: 363164)
Remaining Estimate: 0h
Time Spent: 10m
> Meta space memory leak caused by the shutdown hook of ProcessManager
> ---------------------------------------------------------------------
>
> Key: BEAM-9006
> URL: https://issues.apache.org/jira/browse/BEAM-9006
> Project: Beam
> Issue Type: Bug
> Components: java-fn-execution
> Reporter: sunjincheng
> Assignee: sunjincheng
> Priority: Major
> Fix For: 2.19.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently the class `ProcessManager` will add a shutdown hook to stop all the
> living processes before JVM exits. The shutdown hook will never be removed.
> If this class is loaded by the user class loader, it will cause the user
> class loader could not be garbage collected which causes meta space memory
> leak eventually.
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